Volume 10 in Simon Shuker's challenging Code-Cracker series brings 125 puzzles to get that organ in your head working! An additional "hint letter" is included for each puzzle at the start of the solution pages, for those occasions where you find it hard to get started. Happy puzzling! Shipping: $8 per book. We are happy to combine shipping for multiple purchases, but this may increase the shipping price - please ask us for a quote before purchasing.